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Dev board (in some cases) Arduino + DAC https://www.youtube.com/watch?v=t3kUPjdiq0o for explainer https://drive.google.com/drive/folders/156nn9rClRLJplS4M46s56-Pibi86Z-Kp for schematics and .ino file uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on SIP7, http://power.murata.com/data/power/ncl/kdc_nma.pdf Isolated 1W or 2W Single Output SM DC/DC Converters https://www.murata.com/products/productdata/8807031865374/kdc-nxe1.pdf#page=8 https://www.murata.com/products/productdata/8807031898142/kdc-nxe2.pdf#page=9 Isolated 1W or 2W Single Output SM DC/DC Converters 78sr3.3 78sr5 78sr9 78sr12 78srXX DCDC-Converter, RECOM, RECOM_R-78E-0.5, SIP-3, pitch 2.54mm, size 5.54x6.2mm^2, drill diamater 1.3mm, pad diameter 3mm, see , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_Phoenix THT Terminal Block WAGO 804-103, 45Degree (cable under 45degree), 2 pins, http://cdn-reichelt.de/documents/datenblatt/A500/LED8MMGE_LED8MMGN_LED8MMRT%23KIN.pdf LED diameter 3.0mm z-position of LED center 3.0mm 2 pins LED, Round, Rectangular size 3.0x2.0mm^2, 2 pins, diameter 5.0mm z-position of LED center 9.0mm 2 pins Rectangular size 5.0x2.0mm^2 z-position of LED center 9.0mm 2 pins diameter 3.0mm z-position of LED center 3.0mm 2 pins LED_Rectangular Rectangular Rectangular size 5.0x2.0mm^2 z-position of LED center 3.0mm 2 pins LED_Rectangular Rectangular Rectangular size 4.5x1.6mm^2 2 pins LED_Oval, Oval, Oval size 5.2x3.8mm^2 2 pins LED, diameter 10.0mm, 2 pins, http://www.kingbright.com/attachments/file/psearch/000/00/00/L-5603QBC-D(Ver.12B).pdf LED_Oval Oval Oval size 5.2x3.8mm^2, 2 pins, http://www.kingbright.com/attachments/file/psearch/000/00/00/L-1034IDT(Ver.9A).pdf LED Round Rectangular size 3.9x1.9mm^2, 2 pins, pitch 5.08mm, hole diameter 0.5mm test point THT pad as test point, pitch 2.54mm, package size 0604 3 pins Ceramic Resomator/Filter 7.0x2.5mm^2, length*width=7.0x2.5mm^2 package, package length=7.0mm, package width=2.5mm, 2 pins LED diameter 3.0mm z-position of LED center 1.0mm 2 pins LED, diameter 20.0mm, 2 pins, diameter 8.0mm, 2 pins, Rectangular size 5.0x2.0mm^2 z-position of LED center 2.0mm 2 pins Red 5381 Series LED.

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